bug#61913: java-ts-mode query error for string highlight, due to recent commit in tree-sitter-java.

[Vincenzo Pupillo <v.pupillo@gmail.com>]

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nvim-treesiter seems to use a "lockfile" in which they put the version of
the language parser to be installed (
https://github.com/nvim-treesitter/nvim-treesitter/blob/master/lockfile.json)
to allow some stability I suppose.

Il giorno sab 4 mar 2023 alle ore 10:27 Yuan Fu <casouri@gmail.com> ha
scritto:

>
>
> > On Mar 3, 2023, at 11:10 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> >
> >> From: Yuan Fu <casouri@gmail.com>
> >> Date: Fri, 3 Mar 2023 14:32:02 -0800
> >> Cc: Eli Zaretskii <eliz@gnu.org>,
> >> 61913@debbugs.gnu.org
> >>
> >>>>> Error during redeployment: (jit-lock-function 8295) reported
> >>>>> (treesit-query-error "Node type error at" 42 "(string_literal)
> >>>>> @font-lock-string-face (text_block) @font-lock-string-face"
> >>>>> "Debugging the query with `treesit-query-validate'")
> >>>>>
> >>>>>
> >>>>> The attached patch fixes the problem.
> >>>>
> >>>> Wouldn't removing text_block from our code cause problems if someone
> >>>> uses tree-sitter-java from before the removal?
> >>>>
> >>>> Is there a way to write code which handles text_block if it exists?
> >>>>
> >>
> >> Tree-sitter language grammars really need some versioning system. I
> >> wonder how do we propose such things to them tho...
> >
> > That'd be hard, given that many of them don't even make releases.
> >
> > It should be enough for our purposes to have a possibility of querying
> > the grammar about support for specific features.  Then the version
> > will not matter, only the supported features will.  Maybe we could do
> > that ourselves, on-the-fly, like we do with programs when we want to
> > know whether they support some command-line switch?
>
> We can test whether a node type exists in the grammar, by trying to
> compile a query using that node type. If it returns successfully, then the
> node type exists. But there are other assumptions we make about a grammar,
> like “the 2nd child of a if node must be the condition”. Hopefully these
> more subtle things don’t change easily, because we can’t easily test them.
>
> Yuan
>
>

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